Detection device for circuit breakage and short circuit of secondary coil of electric leakage mutual inductor

一种漏电互感器二次线圈断路和短路的检测装置

Abstract

本发明公开了一种漏电互感器二次线圈断路和短路的检测装置,该装置包括剩余电流信号检测模块、运放模块及主控模块,剩余电流信号检测模块连接运放模块,运放模块连接主控模块;所述剩余电流信号检测模块中的采样电阻根据欧姆定律采样直流电压分量当前值,运放模块放大此直流电压分量,主控模块通过计算放大后的直流电压分量值判断漏电互感器二次线圈的当前状态;剩余电流信号检测模块中的采样电阻将漏电互感器当前交流电流转换为交流电压分量,运放模块放大此交流电压分量,主控模块通过此交流电压分量和采样电阻R1阻值计算出外部剩余电流值。本发明能够简洁有效检测漏电互感器二次线圈断路和短路故障,并能正常测量外部剩余电流值。
The invention discloses a detection device for circuit breakage and short circuit of a secondary coil of an electric leakage mutual inductor. The detection device comprises a residual current signal detection module, an operational amplifier module and a main control module, wherein the residual current signal detection module is used for detecting the operational amplifier module; the operational amplifier module is connected with the main control module; a sampling resistor in the residual current signal detection module is adopted to sample a present value of a direct-current voltage component according to the Ohm's law; the operational amplifier module is used for amplifying the direct-current voltage component; the main control module is used for judging the present state of the secondary coil of the leaking mutual inductor by calculating the amplified value of the direct-current voltage component; the sampling resistor in the residual current signal detection module is used for converting present alternative-current of the leaking mutual inductor into an alternative-current voltage component; the operational amplifier module is used for amplifying the alternative-current component; the main control module is used for calculating an external residual current value according to the alternative-current component and the resistance of the sampling resistor R1. By adopting the detection device, the circuit breakage and short circuit faults of the secondary coil of the leaking mutual inductor can be easily and effectively detected, and the external residual current value can be normally measured.

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    CN-105137268-ADecember 09, 2015广州智光自动化有限公司一种剩余电流互感器采样电路
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